Marked gallbladder wall thickening caused by Epstein–Barr virus‐induced infectious mononucleosis.

Key Clinical Message: In patients with symptoms of viral infection and marked thickening of the gallbladder wall, it is important to suspect acalculous cholecystitis due to Epstein–Barr virus‐induced infectious mononucleosis. A 35‐year‐old Japanese man presented with fever, abdominal right upper quadrant pain, and liver dysfunction. Positive immunoglobulin M and ‐G antibodies and negative nuclear antigen for Epstein–Barr virus were observed. Abdominal ultrasonography revealed a markedly thickened gallbladder wall. Acalculous cholecystitis due to Epstein–Barr virus‐induced infectious mononucleosis was diagnosed. [ABSTRACT FROM AUTHOR]